High frequency switching power supply consists of the following components:
1, the main circuit From the AC power
input, DC output of the entire process, including:
1, input filter: its role is to network the existing clutter filtering, but also hindered the clutter generated by the unit back to the public grid.
2, rectification and filtering: The Power AC power directly to DC rectifier is smoother, for the next level of transformation.
3, inverter: will be rectified DC into high frequency alternating current, which is the core of high-frequency switching power supply, the higher the frequency, size, weight and the smaller the ratio of output power.
4, the output rectifier and filter: the load required to provide reliable DC power supply.
2, control circuit The one hand, sampling from the output, compared with the standard-setting, and then to control the inverter, to change their frequency or pulse width, to output stability, on the other hand,
3, detection circuit Addition to providing protection circuit is run in a variety of parameters, but also provide a variety of data display instruments.
4, auxiliary power Provide all the different requirements of a single circuit power supply.
II switch control regulator principle Switch K to a certain time interval repeatedly connect and disconnect, the switch K connected, the input power source E through the switch K and the filter circuit provided to the load RL, the switch is in the period, power E to provide energy to the load; when the disconnect switch K, the input power cut off energy E will be provided. Can be seen, input power to provide energy to the load is intermittent, for the load to get the energy to provide continuous, switching power supply must have a storage device, the switch is part of the energy will be stored chicago white sox black and red caps in the switch disconnected to the load release. In the figure, the inductor L, capacitor C2 and diode D circuit composed of, they have this feature. Inductor L to store energy when the switch off, stored in the inductor L in the energy released through the diode D to the load, the load by a continuous and stable energy, due to diode D so that the load current continuously, so as freewheeling diode. AB average in the voltage between the EAB can chicago white sox black and red caps be expressed as:
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